Trigger for firearms



Dec. 28, 1948.

V. G. YAWMAN TRIGGER FOR FIREARMS Origiz'mal Filed May 10, 1943 INVENTOR. I/ z/oia 6: Yaw/"17m HTTORNEY Patented Dec. 28, 1948 UNITED I aismae 7 'rarodijgnron FIREQltMS This invention relates to triggers for firearms.

In the-past, it has been the practice to make a.

trigger for at Colt automatic; pistokby subieeting a, single block of metal to aseries of expensive and exacting, machining operations to insure rigidity and accuracy of the finished product. While it has been proposed, tomake suclrtrigeers by welding certain parts thereot-together, such welded; construction has not been acceptableowr ing: to the fact that certain of, the, parts, made of thinstcck had to be welded to; parts madeaqf necessarily thicker stock, with resulting unsatisfactory joints. Furthermore, the welding operation produced irregular surfaces which had to be ground smooth in order to produce a satisfactory finish.

In accordance with the main feature of the present invention, there is provided a trigger having a saddle-shape finger-engaging portion with a channel at its rear to receive a loop-like extens1on.

Other features of the invention relate to a trigger which can be inexpensively manufactured and assembled from sheet metal and yet will be reliable in operation.

In the drawings:

Figs. 1 to 6, inclusive, show the successive steps of making the finger engaging portion of a trigger from a blank of material, Fig. 5 being a section taken on the line 55 of Fig. 4;

Figs. 7, 8 and 9 show successive steps in the blanking and forming of the trigger extension;

Figs. 10 and 11 are respectively a side View and a top view showing the shape of the trigger extension after the final forming operation;

Fig, 12 shows the finger engaging portion and the trigger extension assembled together ready for the staking operation;

Fig. 13 is a side elevation of the finished trigger after the staking operation; and

Fig. 14 is a sectional view taken on the line I 4-- M of Fig. 13, particularly showing how the staking serves to hold the parts of the trigger in assembled relation.

The trigger of the present invention comprises a saddle-shaped, finger-engaging portion l, with a knurled front 2, with a rear channel 3 extending from the top to the bottom thereof. This channel has mounted therein the pairs of oppositely extending lugs 4 on the registering ends of the loop-like trigger extension 5 (Figs. 11 and 13). While theparts may be secured together in any suitable manner, it is preferred to upset parts 6 of the finger portion to engage the rear sides of the lugs 4 with their front sides in contact with rel-aims. (Cl. 42439.),

' the rear surface of the ies. 1 damp-1 1.1.

Th censtr cticn Qt this; tr gger w ll beh tteri unde st edl r m; anexplana i n o ,themethedibx hfihgilh made. Aceo in 7 11 t; the med d Qtmakinetthis nov tr s en heii ger engagin nettin l.- here f-ias amped, frem heet me al t v have the; utline ndi ated ng 1-..,; he-n ext;step, show nFig. 2,.one surf r ega blank 1- is xtending lcneitudinal a alo g a medial. po tion. there ,.,while the reverse side i this; blank; 1s,

provid d with a stra htnarmw depr ssiQnJi else extending lengthwise of the blank substantially medially from one end thereof to the other. After this step, the blank is next bent into arcuate form, as shown in Fig. 3. Following this step, the now arcuate blank is bent into saddle-shaped or U- shaped form about its longitudinal depression, in fact, this depression insures proper bending of the blank and the desired flow of metal during this forming operation. It will be noted that as a result of this forming operation, the blank now is provided at each end thereof, with a pair of ears 9, resulting from the excess material found desirable in holding the arcuate blank during this last-mentioned forming operation. However, in the finished trigger, these ears are unnecessary and consequently the saddle-shaped blank is subjected to a broaching operation which removes them and provides both ends of the formed blank with straight, parallel surfaces 10. The blank thus formed may be subjected to the usual finishing operations to remove burrs and the like.

The extension of the trigger 5 is stamped from sheet metal to provide a blank, comprising a band terminating at each of its ends in a pair of oppositely extending lugs 4, as illustrated in Fig. 7. The extension blank is next formed into the shape illustrated in Figs. 8 and 9 wherein the lug portions 4 thereof are bent into parallel oil'- set relation with respect to the main part of the blank, being connected thereto through curved portions H. In the next forming operation, the blank thus far formed is bent sharply on the diagonal lines l2 to provide the loop-like portion with the two pairs of lugs 4 positioned side by side, as shown in Figs. 10 and 11.

In assembling the two parts of the trigger unit together, the pairs of lugs 4 of the extension are forced into the channel space 3 in the fingerengaging portion, in the position shown in Fig. 12. When thus assembled, the parts are staked together in a suitable press by having portions 6 of the finger portion upset behind the mentioned oer finger p rtion; aszsh wnzin b med. with alkn i r ed. stri 2-:

lugs. Any excess metal may be trimmed away and the parts may be suitably finished in accordance with the well-known practice.

This application is a division of application 486,442, filed May 10, 1943, now Patent 2,404,118 granted July 16, 1 46.

From the foregoing, it will be seen that this invention provides a novel trigger construction wherein a minimum amount of metal stock is required and wherein a novel series of inexpensive blanking and forming operations suflice.

What I claim is: g

l. A trigger comprising a sheet metal finger hold portion substantially U-shaped in transverse section, to provide a rearwardly opening channel, and a sheet metal loop-shaped extension, said extension having end portions in parallel engagement with each other secured in and,

substantially filling a material part of the length of the channel of said portion to extend outwardly therefrom.

2. A trigger comprising a sheet metal finger hold portion saddle shaped in form thereby providing a rearwardly opening channel, and a sheet metal loop'extension having registering end portions, each end portion comprising a pair of oppositely directed lugs-extending generally at right angles to a plane defined by the loop extension, the major portion of said lugs projecting into said channel and being engaged at two of their'opposite edges by the finger hold portion to lock said last mentioned portion in fixed relation to said loop extension. 6

3. A trigger comprising a sheet metal saddle shaped finger hold portion provided with a rearwardly opening channel, and a rearwardly extending sheet metal loop extension having outwardly extending registering end portions in contact with each other and. locked in said channel. r

4. trigger comprising a sheet metal saddle shaped finger hold portion provided with a rearwardly. opening channel, and a sheet metal loop extension having registering end portions, parts of the edges of the finger hold portion being staked to embrace the registering end portions of the loop extension.

VICTOR G. YAWMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 747,585 Browning Dec. 22, 1903 965,661 Schrader July 26, 1910 1,041,267 Gehrig Oct. 15, 1912 1,080,364 Nelson Dec. 2, 1913 1,088,069 Greenleaf Feb. 24, 1914 1,227,668 R'eising May 29, 1917 1,321,817 Gehrig Nov. 18, 1919 1,407,166 Palmer Feb. 21, 1922 1,807,080 Woolever May 26, 1931 

